The Free / Libre / Open Source Web App with the most built-in features
Lighweight CRM, easy to use Kickstarter for web based ERP
Open source project management
Simple, web-based address & phone book
Open Source Social Network Kit written in PHP
Open Source Learning Management System
'vDrive' - your own Cloud Drive!
date selector with year calendar / Jahreskalender Auswahl
Calendar Application for Booking Conference Rooms
Scada for Home Automation
Ristomeal is web application for restaurants, yacht, pizzerias, cafè
Contao Open Source CMS (fka TYPOlight)
WordPress event calendar plugin
Feature packed web application framework.
labcalendar maintains an online calendar for teachers wishing to sign